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  <script>
    // arguments 动态参数 只存在于 函数里面
    // 是伪数组 里面存储的是传递过来的实参
    function fn() {
      let num = 0
      for (let i = 0; i < arguments.length; i++) {
        num += arguments[i]

      }
      console.log(num);
    }
    fn(1, 2, 3, 4, 5, 6, 6)
  </script>
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